Yamaha T-85 Fm tuner mods.

pdul · 11th April 2009, 01:56 AM

Has anybody tried to mod the audio part of a Yamaha T-85 tuner
from 86?
My plan was initialy to just recap. the whole unit, but after opening it a very nice layout was looking at me saying MOOOOD.

As a start maybe replacing some audio opamps
NJM2041S and NJM2043S with some LME49720.
Any comments to that?

planet10 · 11th April 2009, 02:36 AM

Gregg the Geek added a tube analog stage to my T-460 (and blue LEDs). I've been happily using it for the last couple years.

dave

pdul · 11th April 2009, 03:57 AM

It sounds to me like a much bigger project, new power supply, holes for tubes etc. Not really what i had in mind.
The sonic quality of the gismo is already surprisingly good, so i think that something like new faster and more precise opamps
will do and maybe due to lower offset (new opamps) some experiments with replacing some BP caps in the signal path with some one point second order dc servos.
comments are welcome.

grenert · 11th April 2009, 05:41 AM

Is your tuner aligned? I had my T-85 aligned by a tuner expert, along with putting in matched filters and Black Gate output capacitors. I am convinced it was the alignment that did the most good. The specifications were remarkably better following alignment.

pdul · 11th April 2009, 08:39 AM

All i can say is that it is the most precise and noiseless tuner i have had yet and normally i would have been more than satisfied
with its current soundquality if not for my itchy diy fingers

and the discovery of opamps with a slew rate of 3v/uS and caps in the signalpath

pdul · 10th May 2009, 01:43 PM

Hi! I am now back again with my latest changes/improvements of my tuner.
First i have replaced all the electrolytics:
power supply: Rifa 105C and Panasonic FM
Everything else Panasonic FC and Rubycon YXF, Other than that i have replaced the opamps in the audio section with some browndogs SIP-DIL8 and for now i have put some OP275 i had at hand instead of the original NJM2041S and i must say that i have a big improvement in sound quality ofcourse subjective to my ears but anyway a big change.
I forgot to mention that the 4,7uf output caps has been replaced with two 10uf SILMIC face to face instead of the original standard BP Nichicons.
Knowing that OP275 is not axactly state of the art opamps, maybe somebody can suggest something else with transparancy as the target?
Or maybe further modifications?

Sorry for my rusty english

pdul · 10th May 2009, 02:06 PM

Hi again i have now made a local decoupling of the rails which are +- 12v for the opamps with 56uf panasonic FC + 220NF Siemens MKT

11th April 2009, 01:56 AM	#1
pdul diyAudio Member Join Date: Jan 2009	Yamaha T-85 Fm tuner mods. Has anybody tried to mod the audio part of a Yamaha T-85 tuner from 86? My plan was initialy to just recap. the whole unit, but after opening it a very nice layout was looking at me saying MOOOOD. As a start maybe replacing some audio opamps NJM2041S and NJM2043S with some LME49720. Any comments to that?

11th April 2009, 02:36 AM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 3	Gregg the Geek added a tube analog stage to my T-460 (and blue LEDs). I've been happily using it for the last couple years. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi

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11th April 2009, 03:57 AM	#3
pdul diyAudio Member Join Date: Jan 2009	It sounds to me like a much bigger project, new power supply, holes for tubes etc. Not really what i had in mind. The sonic quality of the gismo is already surprisingly good, so i think that something like new faster and more precise opamps will do and maybe due to lower offset (new opamps) some experiments with replacing some BP caps in the signal path with some one point second order dc servos. comments are welcome.

11th April 2009, 05:41 AM	#4
grenert diyAudio Member Join Date: Jan 2008	Is your tuner aligned? I had my T-85 aligned by a tuner expert, along with putting in matched filters and Black Gate output capacitors. I am convinced it was the alignment that did the most good. The specifications were remarkably better following alignment.

11th April 2009, 08:39 AM	#5
pdul diyAudio Member Join Date: Jan 2009	All i can say is that it is the most precise and noiseless tuner i have had yet and normally i would have been more than satisfied with its current soundquality if not for my itchy diy fingers and the discovery of opamps with a slew rate of 3v/uS and caps in the signalpath

10th May 2009, 01:43 PM	#6
pdul diyAudio Member Join Date: Jan 2009	Hi! I am now back again with my latest changes/improvements of my tuner. First i have replaced all the electrolytics: power supply: Rifa 105C and Panasonic FM Everything else Panasonic FC and Rubycon YXF, Other than that i have replaced the opamps in the audio section with some browndogs SIP-DIL8 and for now i have put some OP275 i had at hand instead of the original NJM2041S and i must say that i have a big improvement in sound quality ofcourse subjective to my ears but anyway a big change. I forgot to mention that the 4,7uf output caps has been replaced with two 10uf SILMIC face to face instead of the original standard BP Nichicons. Knowing that OP275 is not axactly state of the art opamps, maybe somebody can suggest something else with transparancy as the target? Or maybe further modifications? Sorry for my rusty english

10th May 2009, 02:06 PM	#7
pdul diyAudio Member Join Date: Jan 2009	Hi again i have now made a local decoupling of the rails which are +- 12v for the opamps with 56uf panasonic FC + 220NF Siemens MKT

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